410.1f - 909-Coding | 909Rtdc

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25 Terms

1
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The group 9SpSpspsp is used to give supplementary information on _____. Although the codes provide for such reporting, unless special instructions are received from the ADM, only two 9-groups shall be used: ____.

special phenomena, 909Rtdc and 931ss

2
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The 909Rtdc shall be used to indicate the ______ and ______

time at which precipitation began or ended, duration and character of precipitation

3
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The 909Rtdc shall be reported whenever group _____ is encoded and the _____ of this group is not encoded as 000

6RRRtR, 000

4
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The 931ss group shall be used to indicate ______ and:

  • The measurement is reported in ____, up to 55 cm

  • Measurements above 55 cm shall be encoded in accordance with Table 15-31

  • The group shall be included at the discretion of the RDG, but only by stations that take 4 staffed synoptic observations daily and when the rounded measurement is 1 or more

  • depth of new fallen snow

  • whole centimetres

5
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What figure indicates that the group 9SpSpspsp included in the report?

9

6
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When selecting the Rt code and there is a choice, use _____.

the smaller code figure

7
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When there are 2 or more time periods of precipitation, always use the _____.

last period

8
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When you have coded ww = 50-98, use the time ____.

at which precipitation began

9
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When you have coded ww = 20-27 and 20, this implies precipitation was in the last hour; therefore use the time ____.

when the last period began

10
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For all ww codes other than 20-27, 29, and 50-98, use the time ____.

that the precipitation ended

11
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The symbol Rt indicates the time at which precipitation given by _____ began or ended. It shall be coded with reference to _____.

RRR, the official time of observation

12
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Code the following Rt

Precipitation Type: -RA

Start: 0817

Stop:

9094

13
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Code the following Rt:

Precipitation Type: -RA

Start: 0817

Stop: 1133

9094

14
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Code the following Rt:

Precipitation Type: -RA

Start: 0817

Stop: 1028

9092

15
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Code the following Rt:

Precipitation Type: -SHRA

Start: 0612

Stop: 0639

Precipitation Type: -SHRA

Start: 0816

Stop: 0845

9092

16
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Code the following Rt:

Precipitation Type: -SHRA

Start: 0542

Stop: 0639

Precipitation Type: -SHRA

Start: 1016

Stop:

9092

17
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Code the following Rt:

Precipitation Type: -SN

Start: 0628

Stop: 1139

Precipitation Type: DRSN

Start: 0812

Stop:

9091

18
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The symbol dc indicates the ____ of precipitation given by RRR.

Occurrences of precipitation shall be considered as separate periods of precipitation when separated by intervals of _____.

duration and character, 15 minutes or more

19
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If only one period of precipitation has occurred during the past 6 hours, which dc codes apply?

0-3

20
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If two or more periods of precipitation have occurred during the past 6 hours, which dc codes apply?

4-7

21
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Code the following Rtdc

Precipitation Type: -RA

Start: 0817

Stop:

90942

22
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Code the following Rtdc:

Precipitation Type: -RA

Start: 0817

Stop: 1133

90942

23
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Code the following Rtdc:

Precipitation Type: -RA

Start: 0817

Stop: 1028

90920

24
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Code the following Rtdc:

Light rain began at 0211Z on the previous day

Precipitation Type: -RA

Start: →

Stop: 0639

Precipitation Type: -RA

Start: 1016

90927

25
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Code the following Rtdc:

Precipitation Type: -SN

Start: 0628

Stop: 1139

Precipitation Type: DRSN

Start: 0812

Stop:

90912